Revert all new recent changes to add PGXS options for TAP and isolation

A set of failures in buildfarm machines are proving that this is not
quite ready yet because of another set of issues:
- MSVC scripts assume that REGRESS_OPTS can only use top_builddir.  Some
test suites actually finish by using top_srcdir, like pg_stat_statements
which cause the regression tests to never run.
- Trying to enforce top_builddir does not work either when using VPATH
as this is not recognized properly.
- TAP tests of bloom are unstable on various platforms, causing various
failures.

contrib/oid2name/Makefile

@@ -6,11 +6,11 @@ PGAPPICON = win32
 PROGRAM = oid2name
 OBJS	= oid2name.o $(WIN32RES)
 
-TAP_TESTS = 1
-
 PG_CPPFLAGS = -I$(libpq_srcdir)
 PG_LIBS_INTERNAL = $(libpq_pgport)
 
+EXTRA_CLEAN = tmp_check
+
 ifdef USE_PGXS
 PG_CONFIG = pg_config
 PGXS := $(shell $(PG_CONFIG) --pgxs)
@@ -21,3 +21,9 @@ top_builddir = ../..
 include $(top_builddir)/src/Makefile.global
 include $(top_srcdir)/contrib/contrib-global.mk
 endif
+
+check:
+	$(prove_check)
+
+installcheck:
+	$(prove_installcheck)